Aspect Ratio Calculator
Enter a ratio or pick a preset — standard video, social (Instagram 4:5, stories, YouTube thumbnails, OG images), devices and print — and solve width or height with a lock on the side you want to keep. Scale by percent, snap to even or multiple-of-16 dimensions for video encoders, swap orientation, and read the simplified ratio and megapixels. The fit calculator shows the scaled size, letterbox bars or crop amounts for contain and cover into any box; a resolution table lists 240p to 8K at your ratio; DPI converts pixels to print size; and CSS aspect-ratio, Tailwind, padding-top and ffmpeg snippets are ready to copy.
aspect-ratio: 16 / 9;aspect-videopadding-top: 56.2500%;<img src="…" width="1920" height="1080" alt="" />-vf "scale=1920:1080"object-fit: contain; width: 1280px; height: 720px;| Name | Size | MP | |
|---|---|---|---|
| 240p | 426 × 240 | 0.10 | |
| 360p | 640 × 360 | 0.23 | |
| 480p | 854 × 480 | 0.41 | |
| 720p (HD) | 1280 × 720 | 0.92 | |
| 1080p (Full HD) | 1920 × 1080 | 2.07 | |
| 1440p (QHD) | 2560 × 1440 | 3.69 | |
| 2160p (4K UHD) | 3840 × 2160 | 8.29 | |
| 4320p (8K UHD) | 7680 × 4320 | 33.18 |
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How to use Aspect Ratio Calculator
- 1Pick a preset ratio or type your own, and enter one dimension — the other is solved.
- 2Lock width or height so ratio changes keep the side you care about; snap to even or ×16 for video.
- 3Use Fit into a box to see scaled size, bars or crop for contain/cover.
- 4Copy the CSS, Tailwind or ffmpeg snippet, or pick a row from the resolution table.
About Aspect Ratio Calculator
Enter a ratio or pick a preset — standard video, social (Instagram 4:5, stories, YouTube thumbnails, OG images), devices and print — and solve width or height with a lock on the side you want to keep. Scale by percent, snap to even or multiple-of-16 dimensions for video encoders, swap orientation, and read the simplified ratio and megapixels. The fit calculator shows the scaled size, letterbox bars or crop amounts for contain and cover into any box; a resolution table lists 240p to 8K at your ratio; DPI converts pixels to print size; and CSS aspect-ratio, Tailwind, padding-top and ffmpeg snippets are ready to copy.
Aspect Ratio Calculator is part of FizzKit — a collection of focused developer and ad-tech tools. Because everything runs locally, it works offline once loaded and never exposes your data to a remote server.